Also, huge firms are generating more cash than ever . This is $ that must go to shareholders such as in the form of buybacks , dividends , or retained earnings , even in the absence of growth. A $1 billion company that generates $100 million in annual profit means that every year shareholders become 10% richer even if the company does not grow earnings or size at all.
Less fertility not such a big deal if people have more disposable income and high standards of living to offset it.
Predictions of overvaluation , crisis, are commonplace and yet the market keeps marching higher. Pays to be optimistic as far as investing is concerned.